[PATCH v2 35/36] soc: fsl: cpm1: qmc: Handle QUICC Engine (QE) soft-qmc firmware

Herve Codina
2024-08-08T07:12:06Z

The QUICC Engine (QE) QMC can use a firmware to have the QMC working in
'soft-qmc' mode.

Handle this optional 'soft-qmc' firmware.

Signed-off-by: Herve Codina <herve.codina@bootlin.com>
---
drivers/soc/fsl/qe/qmc.c | 67 ++++++++++++++++++++++++++++++++++++++++
1 file changed, 67 insertions(+)

diff --git a/drivers/soc/fsl/qe/qmc.c b/drivers/soc/fsl/qe/qmc.c
index b3a9534441ee..3dffebb48b0d 100644
--- a/drivers/soc/fsl/qe/qmc.c
+++ b/drivers/soc/fsl/qe/qmc.c
@@ -10,6 +10,7 @@
#include <soc/fsl/qe/qmc.h>
#include <linux/bitfield.h>
#include <linux/dma-mapping.h>
+#include <linux/firmware.h>
#include <linux/hdlc.h>
#include <linux/interrupt.h>
#include <linux/io.h>
@@ -1649,6 +1650,66 @@ static irqreturn_t qmc_irq_handler(int irq, void *priv)
return IRQ_HANDLED;
}

+static int qmc_qe_soft_qmc_init(struct qmc *qmc, struct device_node *np)
+{
+ struct qe_firmware_info *qe_fw_info;
+ const struct qe_firmware *qe_fw;
+ const struct firmware *fw;
+ const char *filename;
+ int ret;
+
+ ret = of_property_read_string(np, "fsl,soft-qmc", &filename);
+ switch (ret) {
+ case 0:
+ break;
+ case -EINVAL:
+ /* fsl,soft-qmc property not set -> Simply do nothing */
+ return 0;
+ default:
+ dev_err(qmc->dev, "%pOF: failed to read fsl,soft-qmc\n",
+ np);
+ return ret;
+ }
+
+ qe_fw_info = qe_get_firmware_info();
+ if (qe_fw_info) {
+ if (!strstr(qe_fw_info->id, "Soft-QMC")) {
+ dev_err(qmc->dev, "Another Firmware is already loaded\n");
+ return -EALREADY;
+ }
+ dev_info(qmc->dev, "Firmware already loaded\n");
+ return 0;
+ }
+
+ dev_info(qmc->dev, "Using firmware %s\n", filename);
+
+ ret = request_firmware(&fw, filename, qmc->dev);
+ if (ret) {
+ dev_err(qmc->dev, "Failed to request firmware %s\n", filename);
+ return ret;
+ }
+
+ qe_fw = (const struct qe_firmware *)fw->data;
+
+ if (fw->size < sizeof(qe_fw->header) ||
+ be32_to_cpu(qe_fw->header.length) != fw->size) {
+ dev_err(qmc->dev, "Invalid firmware %s\n", filename);
+ ret = -EINVAL;
+ goto end;
+ }
+
+ ret = qe_upload_firmware(qe_fw);
+ if (ret) {
+ dev_err(qmc->dev, "Failed to load firmware %s\n", filename);
+ goto end;
+ }
+
+ ret = 0;
+end:
+ release_firmware(fw);
+ return ret;
+}
+
static int qmc_cpm1_init_resources(struct qmc *qmc, struct platform_device *pdev)
{
struct resource *res;
@@ -1855,6 +1916,12 @@ static int qmc_probe(struct platform_device *pdev)
if (ret)
return ret;

+ if (qmc_is_qe(qmc)) {
+ ret = qmc_qe_soft_qmc_init(qmc, np);
+ if (ret)
+ return ret;
+ }
+
/* Parse channels informationss */
ret = qmc_of_parse_chans(qmc, np);
if (ret)
--
2.45.0